Made of metal material, high strength polishing, electroplating, no rust, no fading. Find the position where you want to install on the board and drill a hole , then pass through the screw from the back of board and thread tight to the knob. The spiral cabinet knob has a solid, durable construction providing long lasting hardware with an elegant, classy look. Perfect for cabinet, dresser, drawers, cupboards, wardrobes in your home, bathroom, living-room, dorm and office., Manufacturer: TRDEWR